a couple of small airplanes flying in front of a large orange moon

Hubble Observes the Total Lunar Eclipse Caption: Taking advantage of a total lunar eclipse in January 2019, astronomers using NASA's Hubble Space Telescope have detected ozone in Earth's atmosphere. This method serves as a proxy for how they will observe Earth-like planets transiting in front of other stars in search of life. M. Kornmesser (ESA/Hubble), NASA, and ESA